Journal of Marine Science and Engineering最新文献

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Quasi-Static Model Test of Pile-Supported Wharf under Cyclic Lateral Loading 循环侧向荷载下桩支承码头的准静态模型试验

Journal of Marine Science and Engineering Pub Date : 2024-01-07 DOI: 10.3390/jmse12010115

Jianfeng Wang, L. Su, Libo Xie, Xianzhang Ling

引用次数: 0

Cooperative Maritime Search of Multi-Ship Based on Improved Robust Line-of-Sight Guidance 基于改进型鲁棒视线制导的多船协同海上搜索

Journal of Marine Science and Engineering Pub Date : 2024-01-05 DOI: 10.3390/jmse12010105

Weili Guo, Cheng Liu, Ting Sun

{"title":"Cooperative Maritime Search of Multi-Ship Based on Improved Robust Line-of-Sight Guidance","authors":"Weili Guo, Cheng Liu, Ting Sun","doi":"10.3390/jmse12010105","DOIUrl":"https://doi.org/10.3390/jmse12010105","url":null,"abstract":"In this paper, an improved robust line-of-sight (RLOS) guidance-based fuzzy sliding mode controller is presented to control underactuated ships to conduct the cooperative maritime search operation under the presented improved creeping line search method. First, considering that the ship cannot perform turning with corners, an improved creeping line search method is presented by integrating the Bezier method into the traditional creeping line search method to smooth the transition points with corners and employing the cubic spline interpolation method to generate continuous reference paths. Second, an improved RLOS guidance method is presented for the first time by exploring the idea of robust adaptive control to mitigate the chattering effect of the RLOS guidance. Third, the fuzzy logic system with approximate ability is integrated into the design of sliding mode controller to handle unknown nonlinear model dynamics and environmental disturbances. Finally, an improved RLOS guidance-based fuzzy sliding mode controller is presented. The closed-loop stability is guaranteed by the Lyapunov theorem. Comparative simulations are conducted to illustrate the advantages and verify the effectiveness of the presented method.","PeriodicalId":508451,"journal":{"name":"Journal of Marine Science and Engineering","volume":"28 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139384065","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Early Jurassic Gypsum within Eastern African Continental Marginal Basins and Its Significance for Gas Play 东非大陆边缘盆地中的早侏罗世石膏及其对天然气开采的意义

Journal of Marine Science and Engineering Pub Date : 2024-01-02 DOI: 10.3390/jmse12010093

Jun Cai, Rong Guo

{"title":"Early Jurassic Gypsum within Eastern African Continental Marginal Basins and Its Significance for Gas Play","authors":"Jun Cai, Rong Guo","doi":"10.3390/jmse12010093","DOIUrl":"https://doi.org/10.3390/jmse12010093","url":null,"abstract":"Although the eastern African continental marginal basins have discovered giant gas fields, it is not clear whether the Early Jurassic gypsum associated with the main source rocks controls the gas play. In this paper, we use well logging, seismic reflection, and organic geochemistry data to synthesize the distribution and origin of the gypsum deposits and their control over the gas play. The results show that from 201 Ma to 183 Ma, a thick suite of mudstone with thin-layered gypsum began to form in the southern gulf-like sea due to water stratification. With the sea level falling since 183 Ma, a thick suite of gypsum was deposited in some grabens, where the sedimentary environment changed to lagoons. The gypsum increases the maturity threshold depth of Lower Jurassic source rocks and delays the peak time of gas generation, resulting in the ongoing filling of East African natural gas reservoirs and the formation of giant reserves. In addition, the gypsum not only controls the distribution of conventional gas but also makes the Lower Jurassic shale, where the faults are not developed, an important place for shale gas exploration in the future due to the good sealing properties of the gypsum.","PeriodicalId":508451,"journal":{"name":"Journal of Marine Science and Engineering","volume":"98 34","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139390367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

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